Telephone system



J. N. RYNOLDS AND F. A. STEAHN.

TELEPHONE SYSTEM.

APPLlcATloN FILED DEC.29.1916.

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TELEPHONE SYSTEM.

APPLICATION FILED DEC.29,19|6.

Patented May 25, 1920.

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J. N. REYNOLDS AND F. A. STEARN.

TELEPHONE SYSTEM.

APPLICATION FILED DEc.29, 1916.y

Patented May 25, 1920.

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TELEPHQNE Speceaton of Letters Eat-ent.

Patented Maj-,I 235, 1920,

Application filed December 29, 1916. Serial No. 139,525.

T 0 all whom t may concern Be it lrnown that we, 'dorm Nnwnnner REYNOLDS and Fnemrmigr A. S'rEsnN, citizens of tlie United States, residing at Greenwich, in tbe county of Faireld andl State of Connecticut, and at llzrterson, in the county of Passaic and State of New Jersey, respectively, llave invented certain new and useful Improvements in Telephone Systems, of which the following is a "full, clear, concise, and exact description.

This invention relates 'to telephone systems, and more particularly to circuit arrangements 'for controlling tlie operation of selectively operable switching devices employed. in automatic teleplione exchanges'.`

ln the' automatictelephone systems now employed for controlling 'the transmission of revertive impulses, i. c., impulses by which the o )eration of the selector switches is determined -in accordance with the setting of a sender ol" tbe impulse receiving type, it is necessary to provide, on

the selector switch, commutators having properly spaced conducting segments corresponding in number to tbe number of groups of trunks served by the switch: At present, if it is desired to vary the nurnber of trunks in a group'it is necessary to provide a new commutator having its conducting segments differently spaced. ln order to avoid this changing ot commutatore, according to the present invention, certain of the test terminals in the terminal bank are used t r controlling the transmission of impulses t' the sender. Tne'test terminals,

so used, may define the limits of a group of .trunks and are electrically distinguished from tlie test terminals associated with the trunk lines l"within the respective group.

ln automatic telephone systems of tbe above described type a stepping relayk is employed to control tne operation of tbe sender in yaccordance with 'the impulses received from the selector. This stepping relay is alternately rendered edective and ineffective by a shunt circuit completed during the operation of the switclie ln tbe present arrangement it is proposed to open and close the operating circuit of said stepping relay under tlie control of tbe switch -instead of sliort-circuiting tbe stepping relay as formerly. This proposed change is advantageous, since it causes the stepping relay quiclrlytlian under the its armature more former arrangement.

ln tbe present system the sequence switches employed are oit astructure similar to that disclosed in tbe patent to Reynolds and Baldwin, No. 1,127,808, and are similar in operation and function to that disclosed in the patent to li/lcBerty,y No. 1,125,519.

The selector switches employed in the system are similar structure tovtlie switch disclosed in patent to Craft and lReynolds, No. 1,123,696, lanuary 5, 1915, Elie operating circuit for tbese switches is fully disclosed in the parent to Lundell, No. 1,168,319, January 18, 1916.

ln the system, as actually used, registers and controlling devices of the structure and arrangement disclosed in Lundell .Patent No. 1,168,319, above mentioned, are employed. Since the operation and arrangement of these registers and the manner in wliiclitliey are controlled, form no partei 'this invention, the registers bave been omitted, and it lias been assumed that the operator will depress certain lreys ci lier key-set to control the actuation'oi tbe proper counting relay of the series,

llie drawings, with Figure 2 placed below Fig. 1 and with F ig. 3 placed below Fig. 2, diagrammatically represent a portion of a semi-automatic telephone sysm embodying the present invention.

to release or retract Vlien the subscriber, located at tbe subf station indicated at 100, removes bis'receiver from the switclilioolr, a circuit is closed fromv 'the' minus pole of battery, through the lefthand winding oi' relay 106, out-er armature and baclr Contact of 'cut-oil relay 107, through tlie substation. apparatus, inner baclr Contact and armature oli cut-oli" relay 107 and the right-hand winding of line relay 106, to `the plus pole obattery. The

relay interrupts the .energizing circuit of the line relay, which, on retracting its armature, interrupts the circuit of the lamp 108. The relay 111 completes a circuit from ground, its armature and front contact, contact 112 and the magnet of a sequence switch 113, to grounded battery, to move the sequence switch out of position 1. -Under the f control of its normal contact 14S- the sequence switch moves into position 2. In position 2of sequence switch 113, a circuit 1s completed from ground,l through contact 114, conductor 115, contacts v202 and 203 ofv sequence switch 200,.,.winding of relay 204,

=. to grounded battery, The relay 204 estab-- -I lishes through its left-hand ,armature a lockingl circuit for itself, which extendsfrom grounded battery, winding ofthe .relay 204, its left-hand front contact and armature,

conductor` 205, conducting portion of the.

commutator 206, coinmutator brush 207, to

ground. Atits right-hand arrnaturerthel relay 204 closesa circuit from grounded battery, magnet of sequence switch 200, contact 208, righthand front contact and armature .parallelcircuit completed through commutator 206 and brush 207 A circuit is also completed at this time for the up-drive magrelay. 204, to

net 209 for elevating the cord-finder 210 to associate an idle sender with the cord circuit, now connected to the calling line. The energizing circuitl or" the up-drive magnet:

- p 209 extends from grounded battery, vwinding of 11p-drive magnet 209, contact .211, right-hand front contact and armature of vates its brus es, under the control of the up-drive magnet 209, until brush 212 encounters contact 213, whereupon relay 214 is energized over a circuit extending from y grounded battery, winding. of relay 214,

contact 215, cord-finder brush 212, terminal 213, conductor -216, contact 116, to ground. The relay 2114 attracts its armature and at its right-hand armature lestablishes. a locking circuit for itself which is maintained until the sequence switch 113 moves out of position 11. This circuit may be traced from grounded battery, winding of relayl 214, Acontact 217right-hand kfront contact and armature of relay 2,14, brush 218, terminal 219, conductor 220, contact 117, to ground. At theV left-hand armature and back Contact of relay 214, one of the energizing circuits ofthe relay 204 is interrupted, and when the cord-finder has accurately centered its brushes on the proper set of lground. The cord-finder. eleterminals, the locking circuit for the relay 204 will be interrupted by reason of -the commu-tator brush 207. engaging an, insulated segment ofthe commutator 206. The

vrelay 204 retracts its armatures and thereby This circuit is established` from groundedbattery, magnet of the sequence switch-200, contact 221, right-hand back contact and armature of relay 204 to ground. VVhenthe sequence switch 200 reaches position 3 a circuit is completed from ground, Contact 223, conductor 224, contact 304, magnetof sequence switch' 300, to grounded battery to move the V*sequence switch 300 out of position 1 and into position 3. While these voperations have been taking place the operator depresses her listeningin key 118n lto telephonically connect her head-set 119 with `the lcalling subscribers substation apparatus.- She thereupon ascertains the number of the ldesired line and proceeds to set up this number on the keyset indicated at the right of Fig. 3. The combination of Vnumber keys depressed determines the' apparatus and link-circuit that will be employed in interconnecting Vthe calling substation 100 and the called substation 156.

The operator,- after depressing the proper keys of the key-set, operates the start key 302,r which closes aJcircuit for moving the sequence switch 200 into position 4. This circuit may be traced from' grounded battery,l magnet of vthe sequence switch 200, Contact 222, conductor 303, start key 3,02, to

' ground. Simultaneously a circuit'is conipleted for moving the sequence switch 300 out of position 3 into position 4. This circuit is established from grounded battery, magnet'ofthe sequence switch 300, contact 305,'start key 302, to ground.

. With the lsequence switch 113 in position 2, sequence switch 200v in position 4, and sequence switch 300 in position 4, a fundamental circuit -is established from lgrounded battery, line relay 1 20, -contact 121, conductor 123, contact 124, conductor 125, terminal .229, lbrush 228,` conductor 309, outer armature and back contact of. upper zero counting relay 308, windings of the stepping relay 307, contact 306, conductor 227, brush 226, terminal 225, conductors 230' and 126. contact 127, commutator brush 128, commutator 129, to ground. The line relay 120 attracts its armatures. and 'at its left-hand v front contact and armature completes a locking circuit for itself through the contact 130, over the circuit described,to ground at' commutator 129. At .the right-hand v front contact and armature of ,relay 120, a circuit is completed for moving sequence switch 113 out of-position 2, and into position 3. This circuit is completed from grounded battery, magnet of the sequence .switch 113, contact 131, right-hand front contact and armature of relay 120, to ground. ln position 3 of the sequence switch 113, a circuit is prepared Jrom grounded battery, winding, left-hand J front contact and armature of .relay 120, contacts 130 and 132, coxnmutator brush 133. Sinrultaneously` a circuit is established for the 11p-drive magnet 134, which circuit may be traced from grounded-battery, winding of magnetJ 134, contact .135, right-hand iront contact and armature of relay 120, to ground. The district selector switch 13G now elevates its brush shalt under control of the 11p-drive magnet 134. As the brush shaft of the district selector switch 136` is elevated, the circuit completed througl the coniniutator-brus'h 128 is opened and, upon the engagement of the commutator segment by brush 133, the circuit prepared i'or re- 120 is closed. rlhe conducting portieri of the commutator 129 is so prepared that either the brush 128 or the brush 133 are in engagement with the conducting portion of the commutator, and for this `reason the circuits controlled by these brushes are alternately closed and opened. The line relay 120 is'thus maintained energized, and the fundamental circuit, above described, is

opened and closed to actuate a series ol'- counting relays, the number of which depends upon which one olf the keys 310 controlling the district brush selection have been depressed. `When the series ot counting relays has been actuated by impulses transmitted under the control of commutator 129, the upper zero counting relay 308 is energized, The relay 308 attracts its armature and at its outer armature and back contact interrupts the fundamental circuit. As soon as the brush' 133 leaves the conducting plate 129, the line relay 120 becomes denergized. At the inner armature and front contact of the relay 303, a circuit is completed from grounded battery, magnet of the seqr ence switch 300, iront contact and inner a ,mature of relay 308, contact 311, to groundto move sequence switch into position G. The counting relays which were locked up become denergized.

With the line relay 120 denergized there is completed a circuit for moving sequence switch 113 intg position 4; This circuit is established from grounded battery, magnet of sequence switch 113, contact 137, righthund contact and arma-ture of relay 120, toy ground. ln position 4 of sequence switch 113, brush tripping magnet 169 is energizedy over a circuit extending 'from grounded battery, magnet 169, Contact 170, to ground. Magnet 169 causes the tripping of the desired set of brushes in the well-known man ner. Simultaneously, the fundamental circuit is restablished from grounded battery,

winding of the relay 120, contact 121, conductor 123, contact spring 138 of polarized relay 139, -conductor 140, contact 141, conductor 125, terminal 229, brush 228, conductor 309, outer armatureand back contact of the.. relay 308, stepping relay 307, contact 306, conductor 227, brush 226, terminal 225, conductors 230 and 126, contact 142, to ground. Line relay 120 v'attracts its armatures and at its left-hand armature and. front contact completes a locking circuit for itself through the contact 130, over the fundamental circuitv described, to ground at contact 142. At the right-hand armature and front contact of relay 120, a circuit is' completed from ground, contact 131, magnet of the sequence switch 113, to grounded bat tery, to move this sequence switch'out of position 4 into position 5. ln. position 5, the operating circuit for the 11p-drive magnet 134 is again completed from grounded. battery, winding of the magnet 134, contact. 135, right-hand front contact and armature of relay 120, to ground. The district selector switch 136, under the control of the up-drive magnetl34, again elevates its brushes.

ln accordance with this invention, the re- Vertiveirnpulses for controlling the, group selection at the selector switch.- are controlled, not by a special commutator,`but by Itest terminals in the terminal banlr of the switch. By reason of employing test terminals of the terminalbanit to' control.y the group of varied impulses it is possible to readily increase, or diminish, the number of trunks in agroup without resorting to a special ytype of commutator.

lt should be stated that the test terminals of idle trunks are connected to battery'and the test terminals of busy trunks are connected to ground through a resistance of approximately one hundred ohms, while the test terminalsdthat are employed to control the sending ot revertive impulses are connected directly to ground,7 A. polarized relay 139 employed invcontrolling the group selection of the selector switch is marginal and will not Voperate when a resistance of one hundred ohms is included in its energizing circuit. i

As the selector switch 1,36 elevates, its brushes 143, 144 and 145, the test brush 145 encounters the testy terminal 143,' which is connected directly to ground. lllfhen the test brush 145 encounters the test'terminal-146, the polarized relay 139 is energized over-a circuit extending from grounded battery, the windings of this relay,contactf147, test brush 145, contact 146, to ground. rEhe po larized relay 139 in this instance attracts its armature and interrupts the fundamental circuit previously traced, and simultaneously completes a circuit for maintaining the line relay 120 energized. This circuit is established from ground, armature of the counting relays in the well-known manner.

Wvhen the selector-switch 136 has been elevated to hunt over a number of groups of ytrunks sufficient to transmit impulses controlling the district group selection as determined 'by the depressed district group' key 312, the upper Zero counting relay 308 is energized and vattracts its armatures. At its outer back contact and armature, the fundamental circuit previously described is interrupted, causing the line relay 120 to denergize. At thev inner armature and front contact of the relay 308, a circuit is completed for moving the sequence switch 300 out of position 6 and into position 8.

This circuit extends from grounded battery,

magnet of sequence switch 300, front contact and inner armature of relay 308, contact 311 to ground.v When the line relay is denergized a circuit is completed from ground, the right-hand armature and back contact of relay 120, contact 137, sequence switch 113 to grounded battery, for moving the sequence switch out of pos1t1on 5. The

sequence switch continues to rotate by reason of a 'circuit completed through its master contact 148, until it reaches posltion 11. The trunk hunting operation of the distrlct selector switch 136 has been omitted, sincey .it forms no part of this invention.

It will be understood, however, in the normal operation of the system, that this trunk hunting operation takes place in position 7 of the sequence switch '113.

Tt is assumed that the trunk hunting operation has taken placeand that the selector brushes 143, 144 and 145 have been 'placed in engagement with the trunk terminals 149,

150 and 1 51 `to extend the calling line to the incoming selector switch indicated by the brushes 152 and 153. When the proper brush and group of trunks have-been selected at. the incoming selector switch, as determined by the depressed incoming brush key 313 and the incoming group key 314, the trunkhunting operation to select an idle trunk to the final selector takes place in the well-known manner. It will be noted that after the transmission of each series of impulses, the sequence switch 300 is advanced in the manner above described.

The iinal selectorpswitch, which is indicated by the brushes 154 and 155, first selects a proper brush which will engage with any line of the group in which the desired line terminates. This brush selection is determined by the depression of one of the of the relay 120 to grounded batince the circuit of the stepping vre- -from grounded battery, winding of magnet units keys 316' and 317 to connect the calling substation 5 with the called substation 153. v

It will be understood that, inthe operation of setting the incomingand iinal selector switchespthe fundamental circuit is4 opened and closed in -the same manner as disclosed in the' description of the district selector switch for controlling the operation of the counting relays. The general structure of the conducting portion of the commutator associated with the incoming and final selector lswitches is similar to that of the conducting portion ofv commutator 129,

- the size of the commutators being dependent 4 upon the maximum number or character of selecting operations desired. At the close of the units series of impulses, when the upper zerocounting relay is energized, the sequence switch 300 is rotated out of position 16 by means of a circuit 'established from grounded battery, magnet ofsequence switch 300, front contact and inner armature of relay 308, con. tact 311, to ground. Sequence switch. 300 continues to rotate until it reaches its' nor'- mal position by reason of a circuit completed through its 'master contact 318. When the sequence switch is rotating through positions 17 and 18, a circuit is completed from ground, contact 319, conductor 320, magnetof sequence switch 200 to grounded battery, to move the sequence switch from 'position 4 into position 8. As soon as the sequence switch 200 reaches position 8, an energizing'circuit, for moving the sequenceswitch 113 out of position 11 and intov position 16, is completed from grounded battery, vmagnet of sequence switch 113, contact 1,57, conductor 158, terminal 232, brush 233, contact 234, to ground. In position y8 of sequence switch 200, a circuit is also completed for the down-drive magnet 235, which circuit may be traced 235, contact 321, conductor 322, contact` 236 to ground. When the cord finder 210 has been restored to its normal position, a circuit is completed for restoring the sequence switch 200 to its normal position. This circuit may be traced from grounded battery magnet of sequence switch 200, contact 237, conducting segment 239 of the commutator, commutator brush 240 -to ground.

At the close of the conversation, the supervsory relays 159 and 160 operate in the well-known manner to indicate to the operator that the call has been terminated. The operator,the1eupon removes the plug 109 from the jack 110 and rcauses the relay 111 to retract its armature. A circuit is now completed for moving the sequence switch 113 out of position 16, which circuit extends from grounded battery, magnet of sequence switch 113, contact 161,' b ack contact and ar- A po.:

arranca uuence switch 113 continues to rotate until reaches position 18 by'reason of a circuit completed When the sequence switch reaches position a. circuit is closed from grounded battery,

'nding of the down-drive magnet 1,62, conicts' 163 and 1&2 to ground. W hen the dis trict selector has been. restored to its norr1 mal position, a circuit is completed fromv grounded. battery, magnet ci sequence switch 113, conductor 164i-, Contact 165, normal segment 166 of the commutator, comrnutator brush ld? to ground, to move the sequence switch 113 into its normal position.

lflhen the sequence switch 113 moved out ot position lo, the incoming selector switch, which was held actuated over a circuit completed through Contact 168, was permitted to release. switch. then takes place in the well-known mannern lllhat is claimed is:

1. ln a telephone system, an incoming line, outgoing lines, a switch for interconnecting said incoming line with of said outgoing lines, movable brushes for the said switch, iizred'terminals associated with said outgoing lines arranged to be engaged by said brushes, a fundamental circuit, a stepping relay and a contact in said circuit, and means controlled by the successive engagenient of one of said brushes with certain of said fixed terminals for opening and closing said circuiti athsaid contact.

ln a telephone system, an incoming line, outgoing lines, a switch or interconnecting said incoming line with any ot said outgoing lines, movable brushes forthe said switch, {fixed terminals associated with said outgoing lines arranged to be engaged by said brushes, a controlling circuit for said switch having branches and means controlled by the engagement of one oi said brushes with certain of said lined terminals for simultaneously opening one oi said branches and closing another of said branches. f

3. ln a telephone system, an incoming line, outgoing lines, a switch for interconnecting said incoming line with any of said outgoing lines, a controlling circuit for said switch, branches for said circuit, a magnet included in a common portion of said circuit, and means controlled by said switch for simultaneously opening one of said branches and for closing another of said branches.

e. ln a telephone system, an incoming line, outgoing lines, a switch for interconnecting said incoming lines with any of said outgoing lines, movable brushes for the said switch, 'fixed terminals associated with said outgoing lines arranged to be engaged by said brushes, a variably controlled device through its master contact 148.

rEhe release oi3 the iinal selector' arranged to govern the setting of said switch and means including one of said movable brushes and said ixed terminals for producing a series ci' impulses to control said device.

5, in a 'telephone system, an incoming line, outgoing lines, a switch for interconnecting said incoming line with any or' said outgoing lines, movable brushes for the said switch, fixed terminals associated with said outgoing lines arranged to beengaged by said brushes, a variably controlled device arranged to govern the setting, of said switch and means controlled by one of said movable brushes for transmitting a series of impulses to operate said device.

6. ln a telephone system, an incoming line, outgoing lines, a switch for interconnecting said vincoming line with any of said outgoing lines, movable brushes for the said switch, fixed terminals associated with said outgoing lines arranged to be engaged by said brushes, some of said lined terminals being electrically distinguished from others of said fixed' terminals, a variably controlled device arranged to govern the settingv of said switch and means operative in response to the engagement of certain fixed terminals by one of said brushes fbr producing a series of impulses for actuating said device.

7. ln a' telephone system, an incoming line, outgoing lines, a switch for interconnecting said incoming line with any oi' said outgoing lines, a variably controlled device for governing the setting of 'said switch, means including a polarized relay `lor controlling the operation of said device, and a circuit for said polarized relay controlled by said switch.

8. ln a telephone system, a selector switch having movable and stationary contacts, a motor magnet for said switch, a relay Jfor controlling the operation of said magnet, a circuit for said relay, a sending device for controlling said circuit, two branches for said circuit, means controlled by said switch for controlling one of said branches, another relay for controlling the other branch, means responsive to the engagement ot certain of said stationary vcontacts by said movable contacts for operating said last-mentioned relay, and means responsive llO to the control of either one of said branches i lzine, outgoing lines, a switch for interconnecting Ysaid "incoming line with any of said :utgoing lines', said switch `,being'provided with movable brushesand fixed terminals, a "counting devicey arranged"'to govern ythe setting 'of said switch,vv an operatingcircuit for said device, 4af' polaifized" ,relay control'- ling said circuit, and a circuit forA said polarized relay closed through certainof said movabley brushes and certain'nes of said fixedlterminals. i 1l. In va telephone system, an incoming line, outgoing lines, aswitch for interconnecting said incoming line' with 'any of said outgoing lines),v a test brush for said switch, a fundamental circuit, a'stepping relay and a contact n said circuit, and means controlled by .said test brush for successively interrupting lsaidcircuit at said contact.

"12. In a telephone system, an incoming line, outgoing line`s`,a switch for interconnecting said incoming'line with any of said outgoinglines, movable brushes for the said switch, fixed terminals associated with said outgoing lines arranged to be engaged by said brushes, some of said iixed terminals being electrically 'distinguished from othersK of said lfixed terminals, a fundamental circuit, a stepping relayand a contact included in said circuit, and means operative in' response to the engagement of certain fixed terminals by one of said brushes for successively interrupting said circuit at said contacts. 'i

. In a telephone system, an incoming line, outgoing lines,A a switch for interconnecting saidvincoming line "with any of' said outging-line's, atest brush for said switch, xed'terminals associated with vsaid outgolines arranged tobe engaged by vsaid nectin'g'y said incoming line with anyof said outgoing lines, a'te'st brush yfor said switch, a series of `xed terminals arranged to be engaged by said brush, certainof said terminals being yassociated with said outgoing lines and being variously electrically characterized to indicateV the busy 'andv idle condition'of said outgoing lines, others of said terminals being electrically distinguished from the firsty mentioned terminals of said series, a variably controlled device arranged .to govern the setting of said switch, and

means includingsaidtest brush and the last mentioned terminals of said series dforconf trolling said device.

In witness whereof we hereunto subscribe our names this 28th day of December, A. D. 1916.

` JOHN NEWBERM REYNOLDS.

FRANKLIN A. STEARN. 

